LF Apogee MQ-200 PAR Meter
 

Any one have one they will never use again or know where is a good place to get one. http://www.aquariumspecialty.com/cat...bb744d67cae110

I have copied this from the net and I will one day buy the sensor.

If you have a good quality multi-meter you can purchase the SQ-120 quantum sensor from Apogee instruments http://www.apogeeinstruments.com/man..._300manual.pdf

The sensor which costs $139.00 measures Milli-volts which you just multiply the reading on your Multi-meter by 5 to give you a very accurate par reading without having to spend hundreds more on the actual Quantum meter.

Good find hillegom! Very useful information for a diy par meter without having to get light diodes and ic chips and some crazy soldering.

Hillegom...can you elaborate? Any good links?

In the link that I have in the post, It describes the sensor SQ 120.
The sensor when illuminated, sends out millivolts, which of course could be read with a multimeter. You multiply the millivolts times 5 and you have the par. I don't have time to reread it now, but that is what I remember.
So if you have a good multimeter, all you need is the sensor.
At present, I do not have good lights. So when I buy new ones, then I will buy the sensor

What does "good" multimeter mean? I have a multimeter but I don't know if it is good enough to work with this sensor. How do I tell? :)

A lot of cheap multimeters can't measure down to millivolt (mV) let alone lower range of mV. Look at your multimeter to see if you have mV or m under Volt selection.

bump still looking for one

still looking can any one get me one ?

Old post but did you find one? Can you let me know where?